1 Site Description Report Callaway Power Plant Highway CC Fu lton , MO 65251 March 4 , 2009 1.0 Background and Objectives The Environmental Protection Agency (EPA) is in the process of developing 316(b) cooling water intake structure requirements that reflect the best technology available (BTA) for minimizing adverse environmental impact for all existing power plants and manufacturing facilities. As part of this process, EPA staff is visiting electric generators and manufacturers to better understand the coolin g water intake structure (CWI S) technologies in use at facilities, including the site

specific characteristics of each facility and how these affect the selection and performance of CWI S technologies. EPA is also visiting facilities to better understand c ooling water use and specific issues or technologies that can affect 316(b) compliance. As part of its site visit to the Labadie Power Plant, EPA also collected information on Ameren ’s Callaway Power Plant. 2.0 Facility Description Callaway is located about 10 miles southeast of the town of Fulton in central Missouri. The facility

operates under NPDES permit MO00 98001 ; the permit was reissued on February 13, 2009 and will expire on February 12, 2014

. 3.0 Electricity Generation and Transmission Callaway is a 1 300 MW nuclear generating station with one reactor. It began operations in 1984 on a 7354 acre site and provides approximately 18% of Ameren’s baseload generating capacity

. The capacity utilization rate (CUR) is approximately

88%. The original site plan s called for a second reactor; Ameren may consid er adding new generating unit s in the future

. 4.0 Cooling Water System and Intake Structure Callaway ’s CWI S is located on the shoreline of the Missouri River, approximately

5 miles south of the facilit y. It is comprised of 3 intake bays, each with one pump and one coarse mesh (1/8”) traveling screen. Under normal operations, only

2 of the pumps operate at a time. The design through

- screen velocity is 0.6 feet per second (fps). The screens automatically rotat e every

8 hours or when a pre

- determined head differential is reached, the screens are2 washed with a high pressure spray , and the debris

- filled water is returned to the river via a trough. The CWI S also has a “fish gate” along the sides of the traveling s creens; this device allows fish trapped behind the trash rack another opportunity to escape. 5.0 Impingement and Entrainment Information In 1985, the facility

conducted impingement studies associated with its closed

cycle cooling s ys tem . Approximately 96% o f the collected fish were shad and drum and resulted in an annual estimate of 2000 impinged fish. 6.0 Cooling Tower Feasibility The facility

uses a concrete hy

perbolic cooling tower as part of its closed

- cycle recirculating cooling s ys tem (CCRS). The circul ating flow for the s ys tem is 818 million gallons per day

(mgd). Makeup water is withdrawn via the CWI S, but the facility can operate up to 12 hours without any water withdrawals. The design intake flow (DIF) for Callaway ’s CWI S is 60 mgd and the average actual intake flow (AIF) is 24.5 mgd. Intake water is treated 1 before being routed to the cooling tower. 2 Approximately 4.8 mgd is blown down each day

. 7.0 Debris Handling Callaway does not have significant problems with debris, but has specific procedures for debris, icing, and low water levels. During high debris and icing periods, it rotates the traveling screens continuously. It operates on two pumps during icing periods and one pump during low river level periods. Also see Section 14.0. 8.0 Repowering/Future Uses Ameren is considering adding additional unit s at Callaway

. 9.0 Cooling Ponds There are no cooling ponds onsite.

1 Treatment consists of flocculation and clarification . Once treated, the water is stored in a clear w ell until needed. 2 Additional units would also use closed cycle cooling as applicable, but the source of cooling or makeup water has not been determined. Note that radial w ells could be drilled at the faci lity; facility representatives stated that the TSS levels in the river water are higher than is preferred and that installing wells may be a simpler solution for makeup w ater.3

10.0 Ownership Callaway is owned b y Ameren, an investor

- owned compan y. 11.0 316(a) EPA did not collect any

information about thermal disc harges at this site; however, due to the use of CCRS, it is likely that there are no issues with the thermal discharge from Callaway

. 12.0 Ash Handling Callaway does not use coal as a fuel and therefore has no ash ponds. 13.0 Air Emissions Controls EPA did not collect any

information about air controls at this site. 14.0 Additional Information Facilit y representatives noted that the CWI S has a desilting spray in the intake bay s; this device is operated for 30 minutes every 12 hours to clean out accumulated sediment. Facilit y representatives stated that the facility was designed with a CCRS largely due to the distance from the river. With such a long construction and permitting period for nuclear facilities, the designers assumed that closed

- cycle cooling was a mo re appropriate choice for this location.
Attachment A Ameren PowerPoint Presentation (March 4, 2009)4

Attachment A

— Ameren PowerPoint Presentation (March 4, 2009) Please see the attached materials.